Spring pitman



Oct. 7 1924.

w. -MCCARTY SPR ING PITMAN Patented Get. 7, 1924.

UNITE@ i renin orties.

WILLAM lfeCARTY, OF HASKELL, OKLAHOMA.

SPRING- Applcaton filed September To all whom t may concern Be it known that 1, VJILLrAM: MCCARTY, a citizen of the United States, residing at Haskell, in the county ot Muskogee andState of Gklahoma, have invented certain new and useful Improvements in Spring Pitmen; and l do declare the #following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

rlhis invention relates to an improved pitman for use in connection with machines such as oil well drills and one object of the invention is to provide a pitman which will be a combination rigid and yieldable pitman and will be so constructed that the end sections thereof may be rigidly connected or connected for sliding longitudinally or cach other against the action of a. coil spring which yieldably holds the end sections against sliding movement.

Another object of the invention is to provide a pitman in which a cushioning spring may be provided to prevent the end sections from striking each other and causing damage when moving under the action of the coil spring which yieldably holds them against n'iovement away from each other.

Another object of the invention is to so construct the pitman that the cushioning spring may be coiled about the sliding sections and serve as means to resist side play and thus prevent danger of breakage when the pitman is in use.

Another object of the invention is to provide a pitman which will be simple in construction and can be easily put together and which will be provided with very etlicient abutment means for engaging the end portions of t-he coil spring which yieldably holds the end sections against movement away from each other.

Another object et the invention is to provide a pitman which can be used in connection with a conventional structure of machine wit-h which a pitman is commonly used.

This invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a view in side elevation showing the improved pitman in use.

Figure 2 is a view showing the improved pitman in longitudinal section.

Figure 3 is a longitudinal sectional view PITMAN.

21, .1.922, Serial No. 589,695.

through the pitman taken at right angles to the showing in Fig. 2.

This improved pitman is used in connection with a drilling machine which includes a walking beam 1 mounted upon a standard 2. Ii rotatably mounted drive shaft carries a drive wl'ieel or pulley d about which passes a belt so that the drive shaft may be rotated Ytrom a suitable source of power. The drive shaft carries a crank arm 6 from which extends the wrist pin 7 and the improved pitman will be positioned as shown clearly in l with one end connected. with the wrist pin and its second end con nected with the walking beam 1 so that as the drive shaft 3 rotates, movement will be imparted to the walking beam.

This pitman is provided with end sections one ot which includes a body portion or wrist pin block 8 provided with an opening to receive the wrist pin 7. This block 8 carries side arms 9 which are secured to the block by securing bolts 10. rlhese arms are also provided with openings 11 and 12 for registering with openings 13 and 14 formed in the second ent section 15 of the pitman. l.With the openings in alinement as shown in n ig. 3 securing pins or bolts 13 and 141 can be passed through the alined openings and the two sections will be rigidly connected and thus a rigid pitman provided. With the securing pins removed, the two end sections of the pitman will be slidable longitudinally of each other. it is desired to yieldably hold the two end sections against sliding movement away from each other g "and in order to do so, there hasy been provided a coil spring 16 which is placed about the overlapping portions o the two sect-ions as shown and las its end portions engaging abutment blocks 1? and 18 carried by the arms 9 and end section 15. It should be further noted that the end section 15 is provided with longitudinally extending grooves 15 and slots 19 and that the side arms 9 of the end section 8 fit into the grooves 15 and carry bolts 19 which pass through these slots, the provision of the grooves and bolts serving to prevent the sections from moving transversely of each other and also ser-ving to prevent pivotal movement with respect to each other. An inner spring 16 has been shown within the spring 1G to assist the spring 16 in its operation but this spring 16 may be omitted if it is found that the llO spring 16 is stron@ enough for the worlr to be performed. lr desired, caps 29 may be provided to engage the ends of the springs. A yoke or bail 21 is secured upon the end section 15 by securing bolts P1 and will litV into a notch 22 'formed in the walking beam 1 so that the bail cannot move longitudinally upon the walking beam and thus move out of the proper position upon this beam.

Vhen this pitman is in use, it is mounted as shown in Fig. 1 and when the drive shaft 3 is rotating, the pitman willbe ii'ioved longitudinally anc will impart rocking movement to the walking beam. lthe two end sections are held against sliding movement, rigid pitman will be provided but it the securing pins are removed, tie two end sections will be free and may have movement longitudinally oLt' each other. lt will thus be seen that there will be provided a yieldable or spring` pitman. The springs 16 and 16 will yieldably hold t-he end sections against movement away from each other but will permit these two sections have the necessary amount of movement. Wlien strain upon the two end sections is Vremoved and the springs 16 and 16 move them longitudinally toward each other, the spring 23 which is positioned between the abutment blocks 18 and shoulders 2li and coiled about the side arms 9 wiil serve as a bumper to prevent the end sections from striking against eac-h other and thus causing damage. Caps 2O similar to those provided 'tor the springs 16 and 16 may be provided if so desired. ln addition to serving as a bumper, the spring 23 also serves as means to resist side play and thus seiwes as strengthening` means toprevent break-r ing of the arms lt will thus be seen that there has been provided a p'itman which may be used as .a rigid pitman or as a spring pitman. lt will be further noted that with this construction, the bolts 10 may be taken out thus releasing the arms V9 and permitting a new spring to be easily put in place in. cz the spring 16, 16" or should become broken. Y

I claim:

1. A pitman comprising end sections, one of said end sections'including arms slidably extending upon opposite sides of the other end section, a coil spring positioned about the overlapped portions of the end sections, abutments carried by the overlapped portions of the end sections and engaging the spring to yieldably hold the end sections `against sliding movement away from each other, removable 1fasteners passed through the overlapped portions of the end tions of the end sectionsy and abutments carried the overlapped portions of the end sectionsV and engaging the spring to yieldabiy hold the end sections against sliding movement away from each other.

3. A. pitman comprising end sections, one section being provided with arms Vextending in overlapping relation to the .other section. abutments extending from `the .arms and second section, a spring about the arms and second section and having its ends'engaging the abutments? and a spring about the arms and having one end engaging the abutment-s of the second section. the section carrying the arms khaving shoulders engaged by the second end oi: the said second springl A pitman comprising end sections7 one of said end sections having longitudinally extending seats and the second including arms slidably extending upon opposite sides or the other end section and litting into 'the seats and held thereby against transverse movement a` coil spring positioned about the overlapped portions: of the end secf tions, and abutments lcarried by the overlapped portions ot the end sections andengaging the spring to yieldably hold the end .sections against sliding movement away from each other.

5. Ai pitman comprisinga pair ot axially alined simultaneously movable sections capable of movement toward and from each other7 removable means in association with said sections for preventing relative` movement thereof, spring means co-acting with said sections for moving them in a direction toward each other when said connecting` means is removed. and a cushioning spring cooperative with the adjacent ends` of said sections for resisting the action oi the Vfirst named spring.

ln testimony Vwhereof l have hereunto afiixed my signature.Y

Wirtin-ivi' Meosnir.

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